I have no idea about how to go about drilling the rear to accommodate a modern caliper
You don't need to, the centre bolt on a front caliper will be long enough to allow you to fit a hex nut. https://www.lfgss.com/conversations/226321/?offset=125#10056988
Don't know why I didn't think of this earlier! Anyone wanna swap a black 105 rear caliper for a front?
Anyone wanna swap a black 105 rear caliper for a front?
If you get a long enough tube nut, you can probably use the rear caliper on the front
Don't know why I didn't think of this earlier!
[cough]
Scroll down to "Mounting recessed-mounting calipers on older frames" on this page, if you don't fancy getting a new bridge installed.
@Miitch started
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You don't need to, the centre bolt on a front caliper will be long enough to allow you to fit a hex nut.
https://www.lfgss.com/conversations/226321/?offset=125#10056988